(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.TWEEN = {}));
}(this, (function (exports) { 'use strict';

  /**
   * The Ease class provides a collection of easing functions for use with tween.js.
   */
  var Easing = {
      Linear: {
          None: function (amount) {
              return amount;
          },
      },
      Quadratic: {
          In: function (amount) {
              return amount * amount;
          },
          Out: function (amount) {
              return amount * (2 - amount);
          },
          InOut: function (amount) {
              if ((amount *= 2) < 1) {
                  return 0.5 * amount * amount;
              }
              return -0.5 * (--amount * (amount - 2) - 1);
          },
      },
      Cubic: {
          In: function (amount) {
              return amount * amount * amount;
          },
          Out: function (amount) {
              return --amount * amount * amount + 1;
          },
          InOut: function (amount) {
              if ((amount *= 2) < 1) {
                  return 0.5 * amount * amount * amount;
              }
              return 0.5 * ((amount -= 2) * amount * amount + 2);
          },
      },
      Quartic: {
          In: function (amount) {
              return amount * amount * amount * amount;
          },
          Out: function (amount) {
              return 1 - --amount * amount * amount * amount;
          },
          InOut: function (amount) {
              if ((amount *= 2) < 1) {
                  return 0.5 * amount * amount * amount * amount;
              }
              return -0.5 * ((amount -= 2) * amount * amount * amount - 2);
          },
      },
      Quintic: {
          In: function (amount) {
              return amount * amount * amount * amount * amount;
          },
          Out: function (amount) {
              return --amount * amount * amount * amount * amount + 1;
          },
          InOut: function (amount) {
              if ((amount *= 2) < 1) {
                  return 0.5 * amount * amount * amount * amount * amount;
              }
              return 0.5 * ((amount -= 2) * amount * amount * amount * amount + 2);
          },
      },
      Sinusoidal: {
          In: function (amount) {
              return 1 - Math.cos((amount * Math.PI) / 2);
          },
          Out: function (amount) {
              return Math.sin((amount * Math.PI) / 2);
          },
          InOut: function (amount) {
              return 0.5 * (1 - Math.cos(Math.PI * amount));
          },
      },
      Exponential: {
          In: function (amount) {
              return amount === 0 ? 0 : Math.pow(1024, amount - 1);
          },
          Out: function (amount) {
              return amount === 1 ? 1 : 1 - Math.pow(2, -10 * amount);
          },
          InOut: function (amount) {
              if (amount === 0) {
                  return 0;
              }
              if (amount === 1) {
                  return 1;
              }
              if ((amount *= 2) < 1) {
                  return 0.5 * Math.pow(1024, amount - 1);
              }
              return 0.5 * (-Math.pow(2, -10 * (amount - 1)) + 2);
          },
      },
      Circular: {
          In: function (amount) {
              return 1 - Math.sqrt(1 - amount * amount);
          },
          Out: function (amount) {
              return Math.sqrt(1 - --amount * amount);
          },
          InOut: function (amount) {
              if ((amount *= 2) < 1) {
                  return -0.5 * (Math.sqrt(1 - amount * amount) - 1);
              }
              return 0.5 * (Math.sqrt(1 - (amount -= 2) * amount) + 1);
          },
      },
      Elastic: {
          In: function (amount) {
              if (amount === 0) {
                  return 0;
              }
              if (amount === 1) {
                  return 1;
              }
              return -Math.pow(2, 10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI);
          },
          Out: function (amount) {
              if (amount === 0) {
                  return 0;
              }
              if (amount === 1) {
                  return 1;
              }
              return Math.pow(2, -10 * amount) * Math.sin((amount - 0.1) * 5 * Math.PI) + 1;
          },
          InOut: function (amount) {
              if (amount === 0) {
                  return 0;
              }
              if (amount === 1) {
                  return 1;
              }
              amount *= 2;
              if (amount < 1) {
                  return -0.5 * Math.pow(2, 10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI);
              }
              return 0.5 * Math.pow(2, -10 * (amount - 1)) * Math.sin((amount - 1.1) * 5 * Math.PI) + 1;
          },
      },
      Back: {
          In: function (amount) {
              var s = 1.70158;
              return amount * amount * ((s + 1) * amount - s);
          },
          Out: function (amount) {
              var s = 1.70158;
              return --amount * amount * ((s + 1) * amount + s) + 1;
          },
          InOut: function (amount) {
              var s = 1.70158 * 1.525;
              if ((amount *= 2) < 1) {
                  return 0.5 * (amount * amount * ((s + 1) * amount - s));
              }
              return 0.5 * ((amount -= 2) * amount * ((s + 1) * amount + s) + 2);
          },
      },
      Bounce: {
          In: function (amount) {
              return 1 - Easing.Bounce.Out(1 - amount);
          },
          Out: function (amount) {
              if (amount < 1 / 2.75) {
                  return 7.5625 * amount * amount;
              }
              else if (amount < 2 / 2.75) {
                  return 7.5625 * (amount -= 1.5 / 2.75) * amount + 0.75;
              }
              else if (amount < 2.5 / 2.75) {
                  return 7.5625 * (amount -= 2.25 / 2.75) * amount + 0.9375;
              }
              else {
                  return 7.5625 * (amount -= 2.625 / 2.75) * amount + 0.984375;
              }
          },
          InOut: function (amount) {
              if (amount < 0.5) {
                  return Easing.Bounce.In(amount * 2) * 0.5;
              }
              return Easing.Bounce.Out(amount * 2 - 1) * 0.5 + 0.5;
          },
      },
  };

  var now;
  // Include a performance.now polyfill.
  // In node.js, use process.hrtime.
  // eslint-disable-next-line
  // @ts-ignore
  if (typeof self === 'undefined' && typeof process !== 'undefined' && process.hrtime) {
      now = function () {
          // eslint-disable-next-line
          // @ts-ignore
          var time = process.hrtime();
          // Convert [seconds, nanoseconds] to milliseconds.
          return time[0] * 1000 + time[1] / 1000000;
      };
  }
  // In a browser, use self.performance.now if it is available.
  else if (typeof self !== 'undefined' && self.performance !== undefined && self.performance.now !== undefined) {
      // This must be bound, because directly assigning this function
      // leads to an invocation exception in Chrome.
      now = self.performance.now.bind(self.performance);
  }
  // Use Date.now if it is available.
  else if (Date.now !== undefined) {
      now = Date.now;
  }
  // Otherwise, use 'new Date().getTime()'.
  else {
      now = function () {
          return new Date().getTime();
      };
  }
  var now$1 = now;

  /**
   * Controlling groups of tweens
   *
   * Using the TWEEN singleton to manage your tweens can cause issues in large apps with many components.
   * In these cases, you may want to create your own smaller groups of tween
   */
  var Group = /** @class */ (function () {
      function Group() {
          this._tweens = {};
          this._tweensAddedDuringUpdate = {};
      }
      Group.prototype.getAll = function () {
          var _this = this;
          return Object.keys(this._tweens).map(function (tweenId) {
              return _this._tweens[tweenId];
          });
      };
      Group.prototype.removeAll = function () {
          this._tweens = {};
      };
      Group.prototype.add = function (tween) {
          this._tweens[tween.getId()] = tween;
          this._tweensAddedDuringUpdate[tween.getId()] = tween;
      };
      Group.prototype.remove = function (tween) {
          delete this._tweens[tween.getId()];
          delete this._tweensAddedDuringUpdate[tween.getId()];
      };
      Group.prototype.update = function (time, preserve) {
          if (time === void 0) { time = now$1(); }
          if (preserve === void 0) { preserve = false; }
          var tweenIds = Object.keys(this._tweens);
          if (tweenIds.length === 0) {
              return false;
          }
          // Tweens are updated in "batches". If you add a new tween during an
          // update, then the new tween will be updated in the next batch.
          // If you remove a tween during an update, it may or may not be updated.
          // However, if the removed tween was added during the current batch,
          // then it will not be updated.
          while (tweenIds.length > 0) {
              this._tweensAddedDuringUpdate = {};
              for (var i = 0; i < tweenIds.length; i++) {
                  var tween = this._tweens[tweenIds[i]];
                  var autoStart = !preserve;
                  if (tween && tween.update(time, autoStart) === false && !preserve) {
                      delete this._tweens[tweenIds[i]];
                  }
              }
              tweenIds = Object.keys(this._tweensAddedDuringUpdate);
          }
          return true;
      };
      return Group;
  }());

  /**
   *
   */
  var Interpolation = {
      Linear: function (v, k) {
          var m = v.length - 1;
          var f = m * k;
          var i = Math.floor(f);
          var fn = Interpolation.Utils.Linear;
          if (k < 0) {
              return fn(v[0], v[1], f);
          }
          if (k > 1) {
              return fn(v[m], v[m - 1], m - f);
          }
          return fn(v[i], v[i + 1 > m ? m : i + 1], f - i);
      },
      Bezier: function (v, k) {
          var b = 0;
          var n = v.length - 1;
          var pw = Math.pow;
          var bn = Interpolation.Utils.Bernstein;
          for (var i = 0; i <= n; i++) {
              b += pw(1 - k, n - i) * pw(k, i) * v[i] * bn(n, i);
          }
          return b;
      },
      CatmullRom: function (v, k) {
          var m = v.length - 1;
          var f = m * k;
          var i = Math.floor(f);
          var fn = Interpolation.Utils.CatmullRom;
          if (v[0] === v[m]) {
              if (k < 0) {
                  i = Math.floor((f = m * (1 + k)));
              }
              return fn(v[(i - 1 + m) % m], v[i], v[(i + 1) % m], v[(i + 2) % m], f - i);
          }
          else {
              if (k < 0) {
                  return v[0] - (fn(v[0], v[0], v[1], v[1], -f) - v[0]);
              }
              if (k > 1) {
                  return v[m] - (fn(v[m], v[m], v[m - 1], v[m - 1], f - m) - v[m]);
              }
              return fn(v[i ? i - 1 : 0], v[i], v[m < i + 1 ? m : i + 1], v[m < i + 2 ? m : i + 2], f - i);
          }
      },
      Utils: {
          Linear: function (p0, p1, t) {
              return (p1 - p0) * t + p0;
          },
          Bernstein: function (n, i) {
              var fc = Interpolation.Utils.Factorial;
              return fc(n) / fc(i) / fc(n - i);
          },
          Factorial: (function () {
              var a = [1];
              return function (n) {
                  var s = 1;
                  if (a[n]) {
                      return a[n];
                  }
                  for (var i = n; i > 1; i--) {
                      s *= i;
                  }
                  a[n] = s;
                  return s;
              };
          })(),
          CatmullRom: function (p0, p1, p2, p3, t) {
              var v0 = (p2 - p0) * 0.5;
              var v1 = (p3 - p1) * 0.5;
              var t2 = t * t;
              var t3 = t * t2;
              return (2 * p1 - 2 * p2 + v0 + v1) * t3 + (-3 * p1 + 3 * p2 - 2 * v0 - v1) * t2 + v0 * t + p1;
          },
      },
  };

  /**
   * Utils
   */
  var Sequence = /** @class */ (function () {
      function Sequence() {
      }
      Sequence.nextId = function () {
          return Sequence._nextId++;
      };
      Sequence._nextId = 0;
      return Sequence;
  }());

  var mainGroup = new Group();

  /**
   * Tween.js - Licensed under the MIT license
   * https://github.com/tweenjs/tween.js
   * ----------------------------------------------
   *
   * See https://github.com/tweenjs/tween.js/graphs/contributors for the full list of contributors.
   * Thank you all, you're awesome!
   */
  var Tween = /** @class */ (function () {
      function Tween(_object, _group) {
          if (_group === void 0) { _group = mainGroup; }
          this._object = _object;
          this._group = _group;
          this._isPaused = false;
          this._pauseStart = 0;
          this._valuesStart = {};
          this._valuesEnd = {};
          this._valuesStartRepeat = {};
          this._duration = 1000;
          this._initialRepeat = 0;
          this._repeat = 0;
          this._yoyo = false;
          this._isPlaying = false;
          this._reversed = false;
          this._delayTime = 0;
          this._startTime = 0;
          this._easingFunction = Easing.Linear.None;
          this._interpolationFunction = Interpolation.Linear;
          this._chainedTweens = [];
          this._onStartCallbackFired = false;
          this._id = Sequence.nextId();
          this._isChainStopped = false;
          this._goToEnd = false;
      }
      Tween.prototype.getId = function () {
          return this._id;
      };
      Tween.prototype.isPlaying = function () {
          return this._isPlaying;
      };
      Tween.prototype.isPaused = function () {
          return this._isPaused;
      };
      Tween.prototype.to = function (properties, duration) {
          // TODO? restore this, then update the 07_dynamic_to example to set fox
          // tween's to on each update. That way the behavior is opt-in (there's
          // currently no opt-out).
          // for (const prop in properties) this._valuesEnd[prop] = properties[prop]
          this._valuesEnd = Object.create(properties);
          if (duration !== undefined) {
              this._duration = duration;
          }
          return this;
      };
      Tween.prototype.duration = function (d) {
          this._duration = d;
          return this;
      };
      Tween.prototype.start = function (time) {
          if (this._isPlaying) {
              return this;
          }
          // eslint-disable-next-line
          this._group && this._group.add(this);
          this._repeat = this._initialRepeat;
          if (this._reversed) {
              // If we were reversed (f.e. using the yoyo feature) then we need to
              // flip the tween direction back to forward.
              this._reversed = false;
              for (var property in this._valuesStartRepeat) {
                  this._swapEndStartRepeatValues(property);
                  this._valuesStart[property] = this._valuesStartRepeat[property];
              }
          }
          this._isPlaying = true;
          this._isPaused = false;
          this._onStartCallbackFired = false;
          this._isChainStopped = false;
          this._startTime = time !== undefined ? (typeof time === 'string' ? now$1() + parseFloat(time) : time) : now$1();
          this._startTime += this._delayTime;
          this._setupProperties(this._object, this._valuesStart, this._valuesEnd, this._valuesStartRepeat);
          return this;
      };
      Tween.prototype._setupProperties = function (_object, _valuesStart, _valuesEnd, _valuesStartRepeat) {
          for (var property in _valuesEnd) {
              var startValue = _object[property];
              var startValueIsArray = Array.isArray(startValue);
              var propType = startValueIsArray ? 'array' : typeof startValue;
              var isInterpolationList = !startValueIsArray && Array.isArray(_valuesEnd[property]);
              // If `to()` specifies a property that doesn't exist in the source object,
              // we should not set that property in the object
              if (propType === 'undefined' || propType === 'function') {
                  continue;
              }
              // Check if an Array was provided as property value
              if (isInterpolationList) {
                  var endValues = _valuesEnd[property];
                  if (endValues.length === 0) {
                      continue;
                  }
                  // handle an array of relative values
                  endValues = endValues.map(this._handleRelativeValue.bind(this, startValue));
                  // Create a local copy of the Array with the start value at the front
                  _valuesEnd[property] = [startValue].concat(endValues);
              }
              // handle the deepness of the values
              if ((propType === 'object' || startValueIsArray) && startValue && !isInterpolationList) {
                  _valuesStart[property] = startValueIsArray ? [] : {};
                  // eslint-disable-next-line
                  for (var prop in startValue) {
                      // eslint-disable-next-line
                      // @ts-ignore FIXME?
                      _valuesStart[property][prop] = startValue[prop];
                  }
                  _valuesStartRepeat[property] = startValueIsArray ? [] : {}; // TODO? repeat nested values? And yoyo? And array values?
                  // eslint-disable-next-line
                  // @ts-ignore FIXME?
                  this._setupProperties(startValue, _valuesStart[property], _valuesEnd[property], _valuesStartRepeat[property]);
              }
              else {
                  // Save the starting value, but only once.
                  if (typeof _valuesStart[property] === 'undefined') {
                      _valuesStart[property] = startValue;
                  }
                  if (!startValueIsArray) {
                      // eslint-disable-next-line
                      // @ts-ignore FIXME?
                      _valuesStart[property] *= 1.0; // Ensures we're using numbers, not strings
                  }
                  if (isInterpolationList) {
                      // eslint-disable-next-line
                      // @ts-ignore FIXME?
                      _valuesStartRepeat[property] = _valuesEnd[property].slice().reverse();
                  }
                  else {
                      _valuesStartRepeat[property] = _valuesStart[property] || 0;
                  }
              }
          }
      };
      Tween.prototype.stop = function () {
          if (!this._isChainStopped) {
              this._isChainStopped = true;
              this.stopChainedTweens();
          }
          if (!this._isPlaying) {
              return this;
          }
          // eslint-disable-next-line
          this._group && this._group.remove(this);
          this._isPlaying = false;
          this._isPaused = false;
          if (this._onStopCallback) {
              this._onStopCallback(this._object);
          }
          return this;
      };
      Tween.prototype.end = function () {
          this._goToEnd = true;
          this.update(Infinity);
          return this;
      };
      Tween.prototype.pause = function (time) {
          if (time === void 0) { time = now$1(); }
          if (this._isPaused || !this._isPlaying) {
              return this;
          }
          this._isPaused = true;
          this._pauseStart = time;
          // eslint-disable-next-line
          this._group && this._group.remove(this);
          return this;
      };
      Tween.prototype.resume = function (time) {
          if (time === void 0) { time = now$1(); }
          if (!this._isPaused || !this._isPlaying) {
              return this;
          }
          this._isPaused = false;
          this._startTime += time - this._pauseStart;
          this._pauseStart = 0;
          // eslint-disable-next-line
          this._group && this._group.add(this);
          return this;
      };
      Tween.prototype.stopChainedTweens = function () {
          for (var i = 0, numChainedTweens = this._chainedTweens.length; i < numChainedTweens; i++) {
              this._chainedTweens[i].stop();
          }
          return this;
      };
      Tween.prototype.group = function (group) {
          this._group = group;
          return this;
      };
      Tween.prototype.delay = function (amount) {
          this._delayTime = amount;
          return this;
      };
      Tween.prototype.repeat = function (times) {
          this._initialRepeat = times;
          this._repeat = times;
          return this;
      };
      Tween.prototype.repeatDelay = function (amount) {
          this._repeatDelayTime = amount;
          return this;
      };
      Tween.prototype.yoyo = function (yoyo) {
          this._yoyo = yoyo;
          return this;
      };
      Tween.prototype.easing = function (easingFunction) {
          this._easingFunction = easingFunction;
          return this;
      };
      Tween.prototype.interpolation = function (interpolationFunction) {
          this._interpolationFunction = interpolationFunction;
          return this;
      };
      Tween.prototype.chain = function () {
          var tweens = [];
          for (var _i = 0; _i < arguments.length; _i++) {
              tweens[_i] = arguments[_i];
          }
          this._chainedTweens = tweens;
          return this;
      };
      Tween.prototype.onStart = function (callback) {
          this._onStartCallback = callback;
          return this;
      };
      Tween.prototype.onUpdate = function (callback) {
          this._onUpdateCallback = callback;
          return this;
      };
      Tween.prototype.onRepeat = function (callback) {
          this._onRepeatCallback = callback;
          return this;
      };
      Tween.prototype.onComplete = function (callback) {
          this._onCompleteCallback = callback;
          return this;
      };
      Tween.prototype.onStop = function (callback) {
          this._onStopCallback = callback;
          return this;
      };
      /**
       * @returns true if the tween is still playing after the update, false
       * otherwise (calling update on a paused tween still returns true because
       * it is still playing, just paused).
       */
      Tween.prototype.update = function (time, autoStart) {
          if (time === void 0) { time = now$1(); }
          if (autoStart === void 0) { autoStart = true; }
          if (this._isPaused)
              return true;
          var property;
          var elapsed;
          var endTime = this._startTime + this._duration;
          if (!this._goToEnd && !this._isPlaying) {
              if (time > endTime)
                  return false;
              if (autoStart)
                  this.start(time);
          }
          this._goToEnd = false;
          if (time < this._startTime) {
              return true;
          }
          if (this._onStartCallbackFired === false) {
              if (this._onStartCallback) {
                  this._onStartCallback(this._object);
              }
              this._onStartCallbackFired = true;
          }
          elapsed = (time - this._startTime) / this._duration;
          elapsed = this._duration === 0 || elapsed > 1 ? 1 : elapsed;
          var value = this._easingFunction(elapsed);
          // properties transformations
          this._updateProperties(this._object, this._valuesStart, this._valuesEnd, value);
          if (this._onUpdateCallback) {
              this._onUpdateCallback(this._object, elapsed);
          }
          if (elapsed === 1) {
              if (this._repeat > 0) {
                  if (isFinite(this._repeat)) {
                      this._repeat--;
                  }
                  // Reassign starting values, restart by making startTime = now
                  for (property in this._valuesStartRepeat) {
                      if (!this._yoyo && typeof this._valuesEnd[property] === 'string') {
                          this._valuesStartRepeat[property] =
                              // eslint-disable-next-line
                              // @ts-ignore FIXME?
                              this._valuesStartRepeat[property] + parseFloat(this._valuesEnd[property]);
                      }
                      if (this._yoyo) {
                          this._swapEndStartRepeatValues(property);
                      }
                      this._valuesStart[property] = this._valuesStartRepeat[property];
                  }
                  if (this._yoyo) {
                      this._reversed = !this._reversed;
                  }
                  if (this._repeatDelayTime !== undefined) {
                      this._startTime = time + this._repeatDelayTime;
                  }
                  else {
                      this._startTime = time + this._delayTime;
                  }
                  if (this._onRepeatCallback) {
                      this._onRepeatCallback(this._object);
                  }
                  return true;
              }
              else {
                  if (this._onCompleteCallback) {
                      this._onCompleteCallback(this._object);
                  }
                  for (var i = 0, numChainedTweens = this._chainedTweens.length; i < numChainedTweens; i++) {
                      // Make the chained tweens start exactly at the time they should,
                      // even if the `update()` method was called way past the duration of the tween
                      this._chainedTweens[i].start(this._startTime + this._duration);
                  }
                  this._isPlaying = false;
                  return false;
              }
          }
          return true;
      };
      Tween.prototype._updateProperties = function (_object, _valuesStart, _valuesEnd, value) {
          for (var property in _valuesEnd) {
              // Don't update properties that do not exist in the source object
              if (_valuesStart[property] === undefined) {
                  continue;
              }
              var start = _valuesStart[property] || 0;
              var end = _valuesEnd[property];
              var startIsArray = Array.isArray(_object[property]);
              var endIsArray = Array.isArray(end);
              var isInterpolationList = !startIsArray && endIsArray;
              if (isInterpolationList) {
                  _object[property] = this._interpolationFunction(end, value);
              }
              else if (typeof end === 'object' && end) {
                  // eslint-disable-next-line
                  // @ts-ignore FIXME?
                  this._updateProperties(_object[property], start, end, value);
              }
              else {
                  // Parses relative end values with start as base (e.g.: +10, -3)
                  end = this._handleRelativeValue(start, end);
                  // Protect against non numeric properties.
                  if (typeof end === 'number') {
                      // eslint-disable-next-line
                      // @ts-ignore FIXME?
                      _object[property] = start + (end - start) * value;
                  }
              }
          }
      };
      Tween.prototype._handleRelativeValue = function (start, end) {
          if (typeof end !== 'string') {
              return end;
          }
          if (end.charAt(0) === '+' || end.charAt(0) === '-') {
              return start + parseFloat(end);
          }
          else {
              return parseFloat(end);
          }
      };
      Tween.prototype._swapEndStartRepeatValues = function (property) {
          var tmp = this._valuesStartRepeat[property];
          var endValue = this._valuesEnd[property];
          if (typeof endValue === 'string') {
              this._valuesStartRepeat[property] = this._valuesStartRepeat[property] + parseFloat(endValue);
          }
          else {
              this._valuesStartRepeat[property] = this._valuesEnd[property];
          }
          this._valuesEnd[property] = tmp;
      };
      return Tween;
  }());

  var VERSION = '18.6.4';

  /**
   * Tween.js - Licensed under the MIT license
   * https://github.com/tweenjs/tween.js
   * ----------------------------------------------
   *
   * See https://github.com/tweenjs/tween.js/graphs/contributors for the full list of contributors.
   * Thank you all, you're awesome!
   */
  var nextId = Sequence.nextId;
  /**
   * Controlling groups of tweens
   *
   * Using the TWEEN singleton to manage your tweens can cause issues in large apps with many components.
   * In these cases, you may want to create your own smaller groups of tweens.
   */
  var TWEEN = mainGroup;
  // This is the best way to export things in a way that's compatible with both ES
  // Modules and CommonJS, without build hacks, and so as not to break the
  // existing API.
  // https://github.com/rollup/rollup/issues/1961#issuecomment-423037881
  var getAll = TWEEN.getAll.bind(TWEEN);
  var removeAll = TWEEN.removeAll.bind(TWEEN);
  var add = TWEEN.add.bind(TWEEN);
  var remove = TWEEN.remove.bind(TWEEN);
  var update = TWEEN.update.bind(TWEEN);
  var exports$1 = {
      Easing: Easing,
      Group: Group,
      Interpolation: Interpolation,
      now: now$1,
      Sequence: Sequence,
      nextId: nextId,
      Tween: Tween,
      VERSION: VERSION,
      getAll: getAll,
      removeAll: removeAll,
      add: add,
      remove: remove,
      update: update,
  };

  exports.Easing = Easing;
  exports.Group = Group;
  exports.Interpolation = Interpolation;
  exports.Sequence = Sequence;
  exports.Tween = Tween;
  exports.VERSION = VERSION;
  exports.add = add;
  exports.default = exports$1;
  exports.getAll = getAll;
  exports.nextId = nextId;
  exports.now = now$1;
  exports.remove = remove;
  exports.removeAll = removeAll;
  exports.update = update;

  Object.defineProperty(exports, '__esModule', { value: true });

})));